Foliar phosphorus
Traditionally responses to foliar phosphorus in broadacre agriculture have been poor, largely due to
the wrong form of P being used
not enough P being applied to the leaf
application of P being made to late in the growing season to maintain yield potential
To explain, the P used in the SprayGro Top Up range of foliar products contains phosphorus as monovalent phosphate ions derived from monoammonium phosphate and phosphoric acid, the most suitable sources of available P for foliar applications. The foliar application rates range between 7.5-10 L/ha in minimum 100-150 Lt water in most broadacre crops due to the fact that leaf cuticles possess intense negative charge which can interfere with phosphate (negative charge) penetration into the leaves. In order to produce more negative phosphate charge over the leaf surface to facilitate phosphate absorption, high spray application rates are required. This approach is different from potassium, ammonium, calcium and metallic trace elements penetration since these nutrients have positive charge ions which are attracted by the negative charge of the cuticle membrane to get into the leaves. For effective anion absorption there must be a gradient of charge difference between the leaf surface and the cuticle.
Phosphorus restores the vital energy production processes by synthesizing new proteins and nucleic acids to increase root and shoot growth. It also helps in cell membrane synthesis, oil production and amino acid synthesis. Phosphorus hastens maturity and help in the development of fruit colour. Early applications of phosphorus, in the beginning of the crop cycle helps in root development, shoot growth and productivity.
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